This is a normal process. Early in the growing season squash plants tend to produce more male blossoms than female blossoms. Since there are no female blossoms for the male plant to pollinate, the male blossoms simply fall off the vine. Your squash vine will eventually produce a more even mix of female and male blossoms. The male blossoms will still fall off the vine but the female blossoms will grow into squash. Be patient.